When silicon is doped with gallium, electrical conduction increases because ________
A)gallium has fewer valence electrons than silicon, so holes are created in the valence band of silicon.
B)gallium has more valence electrons than silicon, so electrons are added to the conduction band of silicon.
C)gallium causes electrons to be transferred from the valence band of silicon to the conduction band of silicon.
D)gallium causes electrons to be transferred from the conduction band of silicon to the valence band of silicon.
E)gallium is a better conductor of electricity than silicon.

Question

Quizplus · Accepted Answer

Gallium has one fewer valence electron than silicon, so when it is doped into silicon, it creates a hole in the valence band that can be easily filled by an electron from an adjacent atom. This increases electrical conductivity as the movement of electrons is more facilitated in the semiconductor.

When Silicon Is Doped with Gallium, Electrical Conduction Increases Because